After cleaning off the soot on the wall, you should take a small round brush and clean the inside of the burner tube. You probably had a spider crawl in there and build a web. That will cause the burner to act up.
Bob
2001 2500 Silverado LS 4x4 6.0, 4.10
2007 Jayco Eagle 288RLS
Cocktails for 6, Dinner for 4, Sleeps 2
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End of dirt road, no signs in sight, sun going down: I am not lost, just getting ready to go camping.